Adjustable triangle or square and protractor.



J. NASH.

ADJUSTABLE TRIANGLE 0R SQUARE AND PROTRACTOR.

APPLICATION FILED Nov. 11, 1915.

Patented Dec. 12, 1916.

Attorneys PATENT FFMFF.

JoNN NASH, or SEATTLE, WASHINGTON.

ADJUSTABLE TRIANGLE OR SQUARE AND PROTRACTQR.

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Specification of Letters Patent.

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Application led ovember 11, 1915. Serial No. 60,913.

To @ZZ whom t may concern Be it known that l, JOI-1N NAsI-I,a citizen ofthe United States, residing at Seattle, in the county of King and Stateof Washington, have invented a new and useful Adjustable Triangle orSquare and Protractor, of which the following is a specification.

The device forming the subject matter of this application is adapted tobe employed for laying off right angles and for laying o'i angles otherthan right angles, the structure combining a triangle and a protractor.ln addition to carrying out the foregoing operations, the invention isadapted to be employed for laying off different angles used inlettering, the structure embodying a movable arm. adapted for thepurpose above mentioned. i it is within the province of the disclosureto improve Generally and -to enhance the utility of devices of that typeto which the present invention appertains.

l/Vith the above and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed can be made within thescope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawing: Figure 1 shows the invention invtop plan,the constituent-members thereof being closed together; Fig. 2 is alongitudinal section on the line 2 2 of Fig. 1; Fig. 3 is a crosssection on the line 3 3 of Fig. 1; Fig. 4 is av plan showing the deviceopened out in use as a right triangle, parts being broken. away; Fig. 5is a fragmental bottom plan; Fig. 6 is an elevation; Fig. 7 is aperspective delineating one of the constituent elements of thestructure;

rlhe device forming the subject matter of this application comprises apair of coperating members 1 and 2 in the form of plates or stripsordinarily fashioned vfrom hard rubber or some other suitable substance,of a like nature. At one end, the members 1 and 2 are beveled as shownat 3, to define edges which, when brought into abutment, as shown inFig. 4, cause the inner edges 21 of the members 1 and 2 to stand at aright angle to each other. The opposite .ends of the membes .1 1112 .2er@ beveledas .ShOWll at 4 to define a right angle when the inner edges21 of the members 1 and 2 are brought together as shown in Fig. 1. Themember 2 is provided with a line of openings 5 disposed parallel to theedge 4'of the member 2. The member 1 is provided with a line of openings5l disposed parallel to the edge 4 ofthe member 1.

Mounted on the member 2 adjacent its beveled edge 3 is a spacer 6 havingan extension 12 prolonged along the member 2 adjacent its inner edge 21.Mounted on the extension 12 adjacent the ends thereof are blocks 51 onwhich is superposed a strip 14 provided at one end with a circular head16 of approximately the same size as the spacer 6, the head 1G having anarm 17 Aterminally provided with a vernier 13. Rivets or like securingelements units the member 2, the extension 12, the blocks 51 and thestrip 14, the latter being provided with an elongated slot 22. Mountedon the member 1 near to its inner edge 21 and near to its beveled edge 3is a block 52 which is located in the same plane with the spacer 6.Superposed upon the spacer 6 is a head 10 having an extension 53 whichlies above the block 52, the head 10 being mounted to move beneath thearm 17 Superposed upon the extension 53 of the head 10 is a strip v7corresponding to the strip 14. interposed between the strip 7 and themember 1 adjacent the beveled edge 4 of the member 1 is a block 54having an extension 55. Rivets 9 or other securing elements unite thestrip 7, the eX- tension 53 of the head 10, the block 52 and the member1, one of these rivets uniting also the strip ,7, the extension 55 ofthe block 54 and the member 1.`

The invention comprises a link` 20, one ond of which moves between theparts 14 and 12 of the member 2, the'saidv end of the link 20 carrying athreaded stud 25 mounted to move in the slot 22 of the strip 14.Threaded onto the stud 25 yis a nut 26 adapted to be clamped onto thestrip 14. The other end of the link 2O enters between the strip 7 and arib 30 Vwhich connects the block 54 with the block 6, and is connectedto the strip 7 by means of a pivot element 24. A threaded stud 28 passesthrough the member 1, the extension 55 of the block 4 and the strip 7and constitutes a pivot for an arm 27, a clamp nut 29 being threadedonto the stud 28 thereby to pinch the parts 55 and 7 down onto the arm27 to hold the lll) .i Vsame in adjusted positions. Y A pivot element 19passes through the spacer' 6, the head 10 and the head 16, and carries aclamp nut 60, v.theV pivot elementV constituting a means wher'eby themembers 1 and 2 are united forv relative swinging movement, the Vmem- Ybers 1 and 2 being cnt away as indicated at Y ment 19. l

which the part 10 is provided. As the members 1 and 2 move withV respectto each v.other from the positions offFig. 1 Yto the rpo-Y sitions ofFig. 4, the said members may be held at any angleby tightening up thenut 26 onthe stud 25, the'stud sliding'in the slot 22 Yof .thelstriplstwhen the angle between the members 1 and 2 is changed. Thestraight edge or arm 27 may bedisposed at Vvarious angles for letteringand other purposes, the straight edge being held in adj usted positionsbytightening up the nut 29. Let it be supposed that it is desired to'draw a circle having a radius of three inches, and to lay down atangent to the circle. Select any opening 5 in the member 2 and selectany opening 5min the member 1. Move the members 1 and 2 apart on thepivot element 19 until the distance between the selected openings 5 and5aV measures three inches. Clamp the members land 2 in the position toAwhich they have been spread. Place a pin inthe selected opening 5 in themember 2 to serve as a center point. Insert a pencil through theselected opening` 5 inthe member 1. Swing the members 1 and 2 (still inclamped relation to each other) with the pin as a center, until thepencil inscribes an arc. vPress down the pencil to make a point wherethe tangent is to be drawn. Swing the members 1 and,

2 to one side with the pin as a center, until the point where thetangent is to be drawn is disclosed. Place a straightY edge against Vthepin and draw a radius from the pin to the tangent point, and prolong theradius an Y inch or two beyond'the arc. VUnclamp the membersl and 2 andswingthem, bothon the pin and withrespect to each other on the pivotelement 19 until, by inspection,

1. In a device of the class described, a pair Vof cooperating members;strips extended longitudinally of the members and secured thereto; apivotal connection between the strips,'one strip being provided with ascale andthe other strip terminating in an extension adapted to moveover the scale, one.

strip being provided with ya slot; a link pivoted to the other strip; astud carried by the link and adapted to ride in the slot; and

f clamping means carried by the stud and cooperating with the slottedstrip.

2'. In a device of the class described7 a pair of coperating members;strips secured tothe longitudinal edges of the members, one stripterminating in a graduated head, and the other strip being provided withmeans for registering on the graduated head;` a straight edge pivoted toone strip; a link pivoted to the said strip; and means for connectingthe link with the other strip for adjustment longitudinally of saidother strip.

3. In a device of the class described, parallel members; means for,pivotally connecting the said members adjacent one end; and means forholding the said members at adjusted angles with respect to each other;each member being Vprovided adjacent its other end with an opening, oneopening being adapted to receive a center point, and the other openingbeing adapted to receive a scriber, whereby an are may be struck andwhereby a point on the arc may be determined by the scriber, that memberwhich is provided with the scriber-receiving opening being movable onthe pivotal connecting means to dispose one edge of said member incoincident relation to' the point determined by the scriber, whereby atangent to the arc may be drawn at said point.

In testimony that I claim the foregoing asmy own, I have hereto aiiixedmy signature in the presence of two witnesses.

Y JOHN NASH.

' Witnesses Y ANDREW NELSON, ELMER MAXEY.

Copies of this patent may be obtainedA for five cents each, byaddressing the Commissioner of Patents,

' Washington, D. C,

